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Use "graybacks" in a sentence
"He knew that Grayback was a nickname for Rebel soldiers and that Confederate notes were dubbed graybacks as a twist on President Lincoln’s new fiat money, greenbacks."
"A wan light played upon the heaving "graybacks" outside the mouth of the harbor."
"Frank would have gladly declined this latter kindness with thanks, as he was conscious that the quantity of "graybacks" his clothing contained did not make him a very desirable sleeping companion for any one, but his friends were so pressing that he was compelled to accede."